Sprint doesn't use SIM cards...
Yes
That last answer is completely false to get a Verizon Sim card you should look at there global phones for example blackberry storm
I have an unlocked Blackberry 9670. Can I purchase a boost sim card and use it in that phone.
No, they are not the same program. It can damage the phone. The Sprint network will not recgonize the sim.
Yes, if the 8830 is unlocked.
yes. once an iphone is universally unlocked it will work.
Yes if you buy an iphone and use geohot's black snow and get an international sprint sim
Any of the major cellular companies' SIM card should fit into a blackberry. After you have bought a SIM card from a cellular company, all you should have to do is place it into the blackberry and activate it.
no unless it is unlocked... .
iphone
If your Blackberry 8830 is already unlocked, then you may be able to use a GSM SIM card on it.
as long as the phone is unlocked you can use it with any sim card. however blackberry does use a different kind of data so you need to make sure your plan is compatible with blackberry